1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
/*
* Broadcom SiliconBackplane chipcommon serial flash interface
*
* Copyright 2004, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*
* $Id$
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/mtd/compatmac.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <typedefs.h>
#include <bcmdevs.h>
#include <bcmutils.h>
#include <osl.h>
#include <bcmutils.h>
#include <bcmnvram.h>
#include <sbconfig.h>
#include <sbchipc.h>
#include <sflash.h>
#ifdef CONFIG_MTD_PARTITIONS
extern struct mtd_partition * init_mtd_partitions(struct mtd_info *mtd, size_t size);
#endif
struct sflash_mtd {
chipcregs_t *cc;
struct semaphore lock;
struct mtd_info mtd;
struct mtd_erase_region_info region;
};
/* Private global state */
static struct sflash_mtd sflash;
static int
sflash_mtd_poll(struct sflash_mtd *sflash, unsigned int offset, int timeout)
{
int now = jiffies;
int ret = 0;
for (;;) {
if (!sflash_poll(sflash->cc, offset)) {
ret = 0;
break;
}
if (time_after(jiffies, now + timeout)) {
printk(KERN_ERR "sflash: timeout\n");
ret = -ETIMEDOUT;
break;
}
if (current->need_resched) {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(timeout / 10);
} else
udelay(1);
}
return ret;
}
static int
sflash_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
int bytes, ret = 0;
/* Check address range */
if (!len)
return 0;
if ((from + len) > mtd->size)
return -EINVAL;
down(&sflash->lock);
*retlen = 0;
while (len) {
if ((bytes = sflash_read(sflash->cc, (uint) from, len, buf)) < 0) {
ret = bytes;
break;
}
from += (loff_t) bytes;
len -= bytes;
buf += bytes;
*retlen += bytes;
}
up(&sflash->lock);
return ret;
}
static int
sflash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
int bytes, ret = 0;
/* Check address range */
if (!len)
return 0;
if ((to + len) > mtd->size)
return -EINVAL;
down(&sflash->lock);
*retlen = 0;
while (len) {
if ((bytes = sflash_write(sflash->cc, (uint) to, len, buf)) < 0) {
ret = bytes;
break;
}
if ((ret = sflash_mtd_poll(sflash, (unsigned int) to, HZ / 10)))
break;
to += (loff_t) bytes;
len -= bytes;
buf += bytes;
*retlen += bytes;
}
up(&sflash->lock);
return ret;
}
static int
sflash_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
{
struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
int i, j, ret = 0;
unsigned int addr, len;
/* Check address range */
if (!erase->len)
return 0;
if ((erase->addr + erase->len) > mtd->size)
return -EINVAL;
addr = erase->addr;
len = erase->len;
down(&sflash->lock);
/* Ensure that requested region is aligned */
for (i = 0; i < mtd->numeraseregions; i++) {
for (j = 0; j < mtd->eraseregions[i].numblocks; j++) {
if (addr == mtd->eraseregions[i].offset + mtd->eraseregions[i].erasesize * j &&
len >= mtd->eraseregions[i].erasesize) {
if ((ret = sflash_erase(sflash->cc, addr)) < 0)
break;
if ((ret = sflash_mtd_poll(sflash, addr, 10 * HZ)))
break;
addr += mtd->eraseregions[i].erasesize;
len -= mtd->eraseregions[i].erasesize;
}
}
if (ret)
break;
}
up(&sflash->lock);
/* Set erase status */
if (ret)
erase->state = MTD_ERASE_FAILED;
else
erase->state = MTD_ERASE_DONE;
/* Call erase callback */
if (erase->callback)
erase->callback(erase);
return ret;
}
#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
#define sflash_mtd_init init_module
#define sflash_mtd_exit cleanup_module
#endif
mod_init_t
sflash_mtd_init(void)
{
struct pci_dev *pdev;
int ret = 0;
struct sflash *info;
uint i;
#ifdef CONFIG_MTD_PARTITIONS
struct mtd_partition *parts;
#endif
if (!(pdev = pci_find_device(VENDOR_BROADCOM, SB_CC, NULL))) {
printk(KERN_ERR "sflash: chipcommon not found\n");
return -ENODEV;
}
memset(&sflash, 0, sizeof(struct sflash_mtd));
init_MUTEX(&sflash.lock);
/* Map registers and flash base */
if (!(sflash.cc = ioremap_nocache(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0)))) {
printk(KERN_ERR "sflash: error mapping registers\n");
ret = -EIO;
goto fail;
}
/* Initialize serial flash access */
info = sflash_init(sflash.cc);
if (!info) {
printk(KERN_ERR "sflash: found no supported devices\n");
ret = -ENODEV;
goto fail;
}
/* Setup region info */
sflash.region.offset = 0;
sflash.region.erasesize = info->blocksize;
sflash.region.numblocks = info->numblocks;
if (sflash.region.erasesize > sflash.mtd.erasesize)
sflash.mtd.erasesize = sflash.region.erasesize;
sflash.mtd.size = info->size;
sflash.mtd.numeraseregions = 1;
/* Register with MTD */
sflash.mtd.name = "sflash";
sflash.mtd.type = MTD_NORFLASH;
sflash.mtd.flags = MTD_CAP_NORFLASH;
sflash.mtd.eraseregions = &sflash.region;
sflash.mtd.module = THIS_MODULE;
sflash.mtd.erase = sflash_mtd_erase;
sflash.mtd.read = sflash_mtd_read;
sflash.mtd.write = sflash_mtd_write;
sflash.mtd.priv = &sflash;
#ifdef CONFIG_MTD_PARTITIONS
parts = init_mtd_partitions(&sflash.mtd, sflash.mtd.size);
for (i = 0; parts[i].name; i++);
ret = add_mtd_partitions(&sflash.mtd, parts, i);
#else
ret = add_mtd_device(&sflash.mtd);
#endif
if (ret) {
printk(KERN_ERR "sflash: add_mtd failed\n");
goto fail;
}
return 0;
fail:
if (sflash.cc)
iounmap((void *) sflash.cc);
return ret;
}
mod_exit_t
sflash_mtd_exit(void)
{
#ifdef CONFIG_MTD_PARTITIONS
del_mtd_partitions(&sflash.mtd);
#else
del_mtd_device(&sflash.mtd);
#endif
iounmap((void *) sflash.cc);
}
module_init(sflash_mtd_init);
module_exit(sflash_mtd_exit);
|
